/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 东莞呵呵
 * Date:2022-03-24
 * Time:15:17
 */
public class TestDemo {
    public static int sum(int n){
        if(n==1){
            return 1;
        }else{
            return n+sum(n-1);
        }
    }
    public static void main(String[] args) {
        System.out.println(sum(5));

    }
}
